Device for spreading and enlarging motor pistons



J. A. F; OSSE I Jan. 30, 1934.

DEVICE FOR SPREADING AND ENLARGING MOTOR PISTONS Filed June 16, 1933 IN VEN TOR.

Patented Jan. 30, 1934 UNETED STATES PATENT QFFICE DEVICE FOR SPREADING AND ENLARGING MQTOR PISTONS 3 Claims.

This invention relates to a device for spreading and enlarging motor pistons.

An object of my invention is the provision of simple and efficient means for enlarging or spreading a worn or used piston, so that its utility or efiiciency will be restored completely.

Another object of my invention is the construction of a spreader device that can be slid to the desired position in the slot of the sleeve of a piston, and secured in position for causing such piston to again have one hundred per cent efiiciency.

The improvements in this application are an outgrowth from the improvement shown and described in my prior patent issued September 6,

1932 and bearing No. 1,875,822.

With the foregoing and other objects in view, my invention comprises certain novel constructions, combinations and arrangements of parts as will be hereinafter fully described, illustrated in the accompanying drawing, and more particularly pointed out in the appended claims.

In the drawing:

Figure 1 is a view in side elevation of a piston showing my invention applied thereto.

Figure 2 is a top plan view of a single-piece spreading device, while Figure 3 is a bottom plan View of the same.

Figure 4 is a sectional view taken on line 44, Figure 2, and looking in the direction of the arrows.

Figure 5 is a bottom plan view of another embodiment of the present invention, while Figure 6 is a top plan view of the same.

Referring to the drawing by numerals, 1 designates the piston as a whole, while 2 is the sleeve thereof. In sleeve 2 is the usual slot 3. In slot 3 I place my single-piece spreading device 4. This device 4 may be adjusted longitudinally of slot 3, and secured permanently in the desired position, as hereinafter described.

The single-piece spreading device 4 comprises an elongated tapering or wedge-like body 5 which is integral with an elliptic head 6; the head 6 is at right angles to the body 5. The head 6 is provided with a thin flanged edge 7 for allowing the spreading device to fit more snugly against the sleeve 2 when positioned. In the center of the head is formed a punch-receiving socket 8, whereby the operator, when the spreader device is positioned, may quickly locate the center of the device for placing the point of the punch in socket 8 and then applying pressure to the punch for permanently fixing the spreader device in the slot. In the improvements shown in my Patent No. 1,875,822, the punch-receiving means is the aperture 10, which aperture does not strengthen the device as much as my socket, of the improved device does. Therefore, the socket 8 is a distinct improvement over the aperture 10 of said patent.

In the embodiment shown in Figs. 5 and 6, the spreading device is the same in all particulars to the embodiment shown in Figures 1 to 4, except that at the center of the elongated body 5, there is formed a tapering cylindrical enlargement 9 similar to the enlarged or rounded part 9 of my Patent No. 1,875,822. However, in this embodiment, the socket 8 is employed in lieu of the aperture 10 of said patent. A device like that shown in Figs. 5 and 6 requires the slot 3 to be formed with circular notches 5, as shown in Patent No. 1,875,822.

The wedge-shape structure of the body is more clearly seen in Fig. 4 of the drawing, as well as the shape of the head 6. When forced finally into its seated position in slot 3, the head 6 of the spreading device will conform to the curved shape of the sleeve 2, whereby a most efficient device is produced.

It is to be understood that the spreading device can be of any size required and that its texture should be substantially the same as the piston itself. Reference should be had to my prior Patent No. 1,875,822 for a further understanding of a device similar to the embodiments disclosed in the present application.

What I claim is:

1. As a new article of manufacture, a singlepiece spreading device for motor pistons, comprising an elongated wedge-like body adapted to be adjusted freely longitudinally of a sleeve-slot, and an elongated head provided centrally with a socket integral with said body.

2. As a new article of manufacture, a singlepiece spreading device for motor pistons, comprising an elongated wedge-like body of the same thickness throughout its length and provided with an elliptic head of the same length, and a punch-receiving socket in said head between its edges.

3. As a new article of manufacture, a singlepiece spreading device for motor pistons, comprising an elongated wedge-like body of uniform thickness throughout its length, an elliptic head on said body and provided with a very thin continuous flange edge entirely around its sides and ends, and said head provided with a punch-receiving socket, substantially as shown and described. JQHANES A. F. OSSE. 

